LT1194C 查看數據表（PDF） - Linear Technology
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LT1194C Datasheet PDF : 12 Pages
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APPLICATIO S I FOR ATIO
Double Terminated Cable Driver
5V
3+ 7
5
6
LT1194
2 – 84
1 –5V
VC
75Ω CABLE
75Ω
Voltage Gain vs Frequency
16
TA = 25°C
14
12
10
8
6
4
2
100k
1M
10M
FREQUENCY (Hz)
100M
LT1194 • TA08
will appear at the (–) input if the feedback loop is properly
closed. In steady state the input signal appears at the
output of the LT1194, and 1/10 of this signal is applied
across the sense resistor. Thus the output current is
simply:
IO
=
VIN
R • 10
The compensation capacitor CC forces the LT1191 to be
the dominate pole for the loop, while the LT1194 is fast
enough to be transparent in the feedback path. The ratio of
the load resistor to the sense resistor should be approxi-
mately 10:1 or greater for easy compensation. For the
example shown the load resistor is 100Ω, the sense
resistor is 5.1Ω, and various loop compensation capaci-
tors cause the output to exhibit an underdamped, critically
and overdamped response.
LT1194
Voltage Controlled Current Source
5V
±VIN 3 + 7
6
LT1191
2– 4
CC
–5V
5V
7 +3
2k
6
5
LT1194
–
4
2
–5V
R
5.1Ω
IO = ±20mA
RL
100Ω
LT1194 • TA09
Output Current Response
CC = 1pF
CC = 3pF
CC = 20pF
LT1194 • TA10
±20mA CURRENT SOURCE WITH DIFFERENT
COMPENSATION CAPACITORS
Differential Video Loop Thru Amplifier
for Power-Down Applications
VIN
CABLE
1.5k
15k
15k
1.5k
5V
3+ 7
2
LT1194
5–
4
– 5V
1% RESISTOR WORST-CASE CMRR = 22dB
TYPICALLY = 38dB
6
OUTPUT
LT1194 • TA11
9
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